Questions tagged [biogeochemistry]

The tag has no usage guidance.

8 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
6
votes
0answers
47 views

Effect of snow on BVOC emmisions of plants/trees

Plants re-emit a substantial fraction of their assimilated carbon into the atmosphere as Biogenic Volatile Organic Compounds (BVOCs) that affect the chemical and physical properties of the atmosphere. ...
4
votes
1answer
145 views

Has Earth's atmosphere lost mass throughout the geological ages due to biological $\small\sf{CO_2}$ fixation?

Stromatolites and other organisms have been storing $\small\sf{CO_2}$ in the form of $\small\sf{CaCO_3}$ throughout the geological ages, forming extensive limestone deposits scattered across Earth's ...
3
votes
0answers
165 views

Where does molecular hydrogen in the atmosphere come from?

This figure from Wikipedia's Atmosphere of Earth shows a hydrogen fraction of 0.000055 percent by volume. Question: Where does molecular hydrogen in the atmosphere come from? Does this come directly ...
3
votes
0answers
56 views

Sulfate reduction

I read a document in which the authors stated "Sulfate and sulfide ( bisulfide and dihydrogen sulfide) both exist within a system just in varying proportions, and aqueous speciation is dependent on Eh/...
3
votes
0answers
44 views

A question about the disruption of global geochemical cycle in anthropocene

We often only hear of problems with the carbon, nitrogen & water cycles etc. I would like to know if there have been any observed problems with other cycles - for example, the iron cycle, ...
2
votes
0answers
34 views

Formation of dolomite

What are the kinetic barriers to dolomite precipitation? Does it precipitate out in solution as quickly as Calcite does?
1
vote
0answers
20 views

Do living things have a magnetic field capable of any level of solar protection?

I understand how anything with an electrical current have a magnetic field including living things. Would a densely populated rain forest or jungle have enough combined magnetic field among the living ...
1
vote
0answers
96 views

Formation of minerals from decomposition of soil

I was wondering if aerobic decomposition of organic rich soils, also rich in calcium and sulfur, can result in the precipitation of gypsum. My thinking is the decomposition would release the ...